What quarterbacks has never been sacked in college football?

The only one I know of is Matt Cassel, who was a backup quarterback at USC to Carson Palmer (2002) and Matt Leinart (2003-2004), both of whom were Heisman Trophy winners. He did start one game, but that was at halfback rather than quarterback. He was drafted in the 7th round by the New England Patriots and now plays for the Kansas City Chiefs.